JPH0334128Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention allows the force applied to the backrest of the chair to be received by the fixing member of the support column via a cushioning material, and the force is directly applied to fasteners such as bolts and screws. This invention relates to a chair backrest attachment device that prevents the application of

(Prior Art) A conventional backrest attachment device includes one shown in FIG. 5, for example.

In this method, a cushion 32 is made by covering the cushion material with a plywood board 30 and a skin cover 31 such as woven fabric, and this cushion 32 is fitted to a back plate 33 of a resin cover or an iron plate. At the rear of the back plate, there is a T-shaped support 35 that is attached via a rubber cushioning material 34.
Screw 3 into the two mounting holes 36, 36 of this lower support column.
7 is inserted and screwed into a nut 38 inserted into the plywood board 30 to assemble them into one piece.

(Problem to be solved by the invention) However, in the above mounting device, the back plate of the backrest is generally curved to fit the seated person, and furthermore, the peripheral edge of the horizontal plate member of the T-shaped support is in contact with this curved surface. It is only attached and fixed with two screws.

Therefore, when excessive force is applied to the backrest, as shown in FIG. 6, the backrest receives force in the front-rear direction (in the direction of the arrow in the figure), so that the center part A of the backrest, which is the fulcrum, The part that is fixed with the screws will receive the most load.

As a result, a direct load is applied to the left and right threaded portions of the T-shaped support, causing the threads to break or loosen. If the screws become loose, the backrest will be subjected to additional force in the front and back direction, causing the backrest to swing more than necessary, as shown by the dashed line in the figure, which may cause cracks in the cushioning rubber, plywood, and resin cover. This results in the problem of frequent damage accidents.

In order to solve the above problems, the present invention aims to increase the strength of the backrest by dispersing the force applied to the backrest so that it is not concentrated at one point or in a horizontal straight line, and to increase the strength of the backrest. To provide a chair backrest mounting device which prevents a horizontal plate member of a support post from being exposed.

(Means for Solving the Problems) In order to achieve the above object, the device of the present invention is such that both ends of the horizontal plate member are compressed and clamped by a pair of mating plate members 14 and 15 via a soft cushioning material 11, respectively. and a plurality of locations of the laminated plate member extending outward from the clamping portion of the laminated plate member are fixed to the front surface of the back plate with fasteners, and the cushions of the back rest are arranged on the front surface of the back plate. It is characterized by covering the plate member and the fastener.

(Function) When a soft cushioning material is fitted into each end of the horizontal plate member of the column and this cushioning material is surrounded by the laminated plate member, the movement of both ends of the horizontal plate member is regulated and no rattling occurs. .

Therefore, by fixing the mating plate member to the back plate without providing screw mounting holes in the horizontal plate member,
The horizontal plate member is fixed.

Moreover, since the mounting holes of the laminated plate members are provided at positions spaced apart from each other on the left and right sides of the horizontal plate member and in the vertical direction perpendicular to the horizontal plate members, the load applied to the back plate is The force is indirectly applied to the entire plate member, and the force is dispersed.

As a result, excessive force is not applied to the mounting screws, so the screws do not come loose or break, and the strength of the backrest increases.

Furthermore, since the tips of the pillars are located on the front side of the back plate, no obstructive appendages are exposed on the rear side of the back plate, resulting in a streamlined design. On the other hand, on the front side of the back plate, the mounting screws do not protrude forward and are fixed by the mating plate members, so a flat surface is formed and the elastic texture of the cushion can be made uniform.

(Example) Embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, in this device, the tip of the support column 1 is attached to the front surface 2a of the back plate 2, and the back cushion 3 is attached to the back plate 2 by various fixing means (not shown). It is assembled.

The column 1 is divided into an outer column 5 for adjusting the height of the backrest and an inner column 6 by operating a push button 4, and the inner column 6 is made of two resin sheets sandwiching a steel plate 7 as a core. It is composed of outer frames 8 and 9.

The tip of the iron plate 7 is welded to the horizontal plate member 10 of the support column 1, and soft cushioning materials 11, 11 are fitted into both ends of the horizontal plate member 10. Furthermore, a laminated plate member 12 surrounding the periphery of the cushioning materials 11, 11 is provided.
is attached to the back plate 2 with screws 13 to restrict the movement of the horizontal plate member 10.

As shown in FIG. 3, the cushioning material 11 has a rectangular cylindrical shape and has protrusions 11a protruding in parallel on one side of the wide part.
The hollow portion 11b has a rectangular cross section, and its size is slightly smaller than that of the horizontal plate member 10.

The laminated plate member 12 includes a casing plate 14 having a recess 14a matching the width of the cushioning material 11;
It consists of a triangular plate 15 that fits on the upper surface of a flange portion 14b formed by bending both ends of the recessed portion of the casing plate 14.

The flange portion 14b of the casing plate 14 has two mounting holes 14c, 14c, and the mounting hole 14c is connected to the three mounting holes 15 of the triangular plate 15.
The pitch intervals are matched to the two a, 15a, and 15a.

On the other hand, a back plate 2 that covers the entire bottom of the cushion 3
has a conical rib portion 7 having a mounting hole 16 erected on its front surface 2a, and this rib portion 17 has three ribs 7 around both ends of the horizontal plate member 10 in accordance with the mounting position of the triangular plate 15. They are placed individually.

Therefore, the horizontal plate member 10 is
The mating plate member 12 that fixes the rib part 1 of the back plate 2
7 with a total of six screws 13.

Next, how to assemble the mounting device in this embodiment will be explained along with its functions.

First, the soft cushioning material 11 is fitted into both ends of the horizontal plate member 10, respectively. A casing plate 14, 1 is attached to each buffer material 11, 11 so that the three sides of the buffer material 11 are surrounded by the recess 14a of the casing plate 14.
4, and fit the triangular plate 15 onto the flange portion 14a of the casing plate 14. This mating plate member 12 is attached to the rib portion 17 of the back plate 2.
and fix them with screws 13, respectively.

As a result, the cushioning material 11 surrounding the horizontal plate member 10 is compressed and fixed in the space surrounded by the casing plate 14 and the triangular plate 15.

At this time, the protruding portion 10a facilitates the screw tightening work, and after tightening, the horizontal plate member 10a
This is provided to impart elasticity to the cushioning material 11 so that it can be sufficiently pressed down by the mating plate member 12.

In this way, the horizontal plate member 10 which is the tip of the support column 1
is fixed to the back plate 2 with a mating plate member 12 via a cushioning material. The mating plate member 12 is the front surface 2a of the back plate 2.
Other shapes may be used as long as a flat surface can be formed without increasing the height of the rib portions 17 and the like that protrude.

The back cushion 3 is then attached to the front surface of the back plate 2, and various methods have been used in the past.
The cushion 3 can be attached to the back plate 2 by pasting an adhesive member such as Magic Tape (registered trademark), or an appropriate number of fixtures can be arranged around the periphery of the back plate 2, and iron wires can be attached to the periphery on the cushion side. buried,
It is also possible to expose the iron wires in the portions corresponding to the respective fixtures, and to utilize fixing means such as connection with snap fittings.

(Effects) As is clear from the above configuration, in the present invention, the load applied to the backrest acts indirectly on the entire horizontal plate member via the cushioning material, and the mounting screws are mounted on a mating plate member having a flat surface with wide intervals. Since the horizontal plate member is pressed down and fixed to the back plate, the force is dispersed and the strength of the backrest can be increased.

In addition, by making the front surface of the back plate a flat surface without any protrusions using the laminated plate member, it is possible to make the thickness of the cushion uniform and to improve the texture due to the elasticity of the cushion.

Furthermore, by arranging the tips of the pillars between the back plate and the cushion, the mounting frame, screws, etc. are not exposed at the rear of the back plate, resulting in the effect of simplifying the design of the chair.

[Brief explanation of the drawing]

Fig. 1 is a partially vertical side view of an embodiment of the present invention, Fig. 2 is a cross-sectional plan view of Fig. 1, Fig. 3 is an assembled perspective view of the main parts of the embodiment, and Fig. 4 is its assembly. FIG. 5 is a perspective view showing the assembly of the conventional example, and FIG. 6 is a side view showing the swing state in FIG. 5. 1... Support column, 2... Back plate, 3... Cushion,
10...Horizontal plate member, 11...Soft cushioning material, 12
...Laminated plate parts.

Claims (1)

[Scope of Claim for Utility Model Registration] A chair backrest installation in which a backboard 2 of the backrest is fixed to a horizontal board member 10 provided at the tip of the support column of the backrest, and the front surface of this backboard is covered with a cushion of the backrest. In the apparatus, both ends of the horizontal plate member are compressed and clamped by a pair of laminated plate members 14 and 15 via a soft cushioning material 11, and the laminated plate member extends outward from the clamped portion of the laminated plate member. A backrest attachment device, characterized in that a plurality of locations of the backrest are fixed to the front surface of the backboard with fasteners, and the cushion of the backrest covers both the plate members and the fasteners arranged on the front side of the backboard.